<!-- 飞机跟踪，参考地址
https://cesium.com/learn/cesiumjs-learn/cesiumjs-flight-tracker/#step-1-set-up-your-cesium-app
 -->

<template>
  <div class="container">
    <div id="cesiumContainer"> </div>
  </div>
</template>


<script>
  export default {
    data() {
      return {}
    },
    mounted() {
      var Cesium = this.Cesium;
      var viewer = new Cesium.Viewer("cesiumContainer", {
        terrainProvider: Cesium.createWorldTerrain()
      });
      var scene = viewer.scene;

      const osmBuildings = viewer.scene.primitives.add(Cesium.createOsmBuildings());

      const flightData = JSON.parse(
        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      );

      const timeStepInSeconds = 30;
      const totalSeconds = timeStepInSeconds * (flightData.length - 1);
      const start = Cesium.JulianDate.fromIso8601("2020-03-09T23:10:00Z");
      const stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate());
      viewer.clock.startTime = start.clone();
      viewer.clock.stopTime = stop.clone();
      viewer.clock.currentTime = start.clone();
      viewer.timeline.zoomTo(start, stop);
      // Speed up the playback speed 50x.
      viewer.clock.multiplier = 50;
      // Start playing the scene.
      viewer.clock.shouldAnimate = true;

      const positionProperty = new Cesium.SampledPositionProperty();

      for (let i = 0; i < flightData.length; i++) {
        const dataPoint = flightData[i];

        // Declare the time for this individual sample and store it in a new JulianDate instance.
        const time = Cesium.JulianDate.addSeconds(start, i * timeStepInSeconds, new Cesium.JulianDate());
        const position = Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height);
        // Store the position along with its timestamp.
        // Here we add the positions all upfront, but these can be added at run-time as samples are received from a server.
        positionProperty.addSample(time, position);

        viewer.entities.add({
          description: `Location: (${dataPoint.longitude}, ${dataPoint.latitude}, ${dataPoint.height})`,
          position: position,
          point: {
            pixelSize: 10,
            color: Cesium.Color.RED
          }
        });
      }
      let airplaneUri = '../../../static/models/Cesium_Air.glb'
      // STEP 4 CODE (green circle entity)
      // Create an entity to both visualize the entire radar sample series with a line and add a point that moves along the samples.
      const airplaneEntity = viewer.entities.add({
        availability: new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({
          start: start,
          stop: stop
        })]),
        position: positionProperty,
        orientation: new Cesium.VelocityOrientationProperty(positionProperty),
        model: {
          uri: airplaneUri,
          minimumPixelSize: 128,
          maximumScale: 20000
        },
        // point: {
        //   pixelSize: 30,
        //   color: Cesium.Color.GREEN
        // },
        path: new Cesium.PathGraphics({
          width: 3
        })
      });
      // Make the camera track this moving entity.
      viewer.trackedEntity = airplaneEntity;
    }


  };
</script>

<style scoped="scoped">
  .container {
    width: 100%;
    height: 100%;
  }

  #cesiumContainer {
    width: 100%;
    height: 100%;
    position: absolute;
    margin: 0;
    padding: 0;
    /*  overflow: hidden; */
  }
</style>
